If Ghost Trick: Phantom Detective generated the same gross revenue on the Epic Games Store, CAPCOM Co., Ltd. would keep approximately $4,060,877 - that's $926,088 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $417,392. Epic charges 0% on the first $1 million in annual per-app revenue and then 12% on the remaining amount. On GOG (30% cut), the developer would earn approximately $3,134,789.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.